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If you've ever played an old LP record where the hole was not quite centered, you've heard the pitch rise and fall with each revolution. 要是你播放過老式慢轉密紋唱片，你就能聽到，儅唱片的空穴沒有置於唱機正中央，唱片每轉一周，音樂都會有音調高低的變化。